Regex to pull out C function prototype declarations?

Question

I\'m somewhere on the learning curve when it comes to regular expressions, and I need to use them to automatically modify function prototypes in a bunch of C headers. Does

Answer 1

As continue of the great Dean TH answer

This will find

• Only functions and not the declaration too
• And Function that returns pointers

^([\w\*]+( )*?){2,}\(([^!@#$+%^;]+?)\)(?!\s*;)

Answer 2

Assuming your code is formatted something like

type name function_name(variables **here, variables &here)
{
    code
}

Here’s a one-liner for Powershell:

ls *.c, *.h | sls "^(\w+( )?){2,}\([^!@#$+%^]+?\)"

Which returns results like:

...
common.h:37:float max(float a, float b)
common.h:42:float fclamp(float val, float fmin, float fmax)
common.h:51:float lerp(float a, float b, float b_interp)
common.h:60:float scale(float val, float valmin, float valmax, float min,
float max)
complex.h:3:typedef struct complex {
complex.h:8:double complexabs(complex in)
complex.h:13:void complexmult(complex *out, complex a, complex b)
complex.h:20:void complexadd(complex *out, complex a, complex b)
complex.h:27:int mandlebrot(complex c, int i)
...

To see just the line without the file specifics, add format-table -property line (or abbreviated as ft -p line):

ls *.c, *.h | sls "^(\w+( )?){2,}\([^!@#$+%^]+?\)" | format-table -p line

Which returns:

Line
----
void render(SDL_Surface *screen)
void saveframe(SDL_Surface *screen)
int handleevents(SDL_Surface *screen)
int WinMain(/*int argc, char* args[]*/)
void printscreen(SDL_Surface *screen, unsigned int exclude)
void testsection(char name[])
void sdltests(SDL_Surface *screen, SDL_Window *window, int width, int height)
int WinMain(/*int argc, char *argv[]*/)
int random(int min, int max) {
int main(int argc, char *argv[])

BONUS: Explanation of the regex:

^(\w+(\s+)?){2,}\([^!@#$+%^]+?\)
^                                Start of a line
 (         ){2,}                 Create atom to appear to or more times
                                 (as many as possible)
  \w+(\s+)?                      A group of word characters followed by
                                 an optional space
                \(            \) Literal parenthesis containing
                  [^!@#$+%^]+?   A group of 0 or more characters
                                 that AREN'T in “!@#$+%^”